10. No. Being able to see a shrink isn't going to stop impulse killings.

I just read an article on gun suicide survivors. They asked them how long between deciding to kill yourself and pulling the trigger?

25% said 5 minutes.
another 25% said <20 minutes.
another 25% said <1 hour.

that's suicide, but it demonstrates that often, these are impulses, blinding anger, lashing out. sure, it would be peachy if rage killers had treatment so they never get to that point, but that's not realistic. more realistic is that they don't have easy, quick access to high-powered firearms.

then maybe some stab 4 people to death, but it is unlikely that the body count would be as high as with guns.